The Welsh capital was the location of Joshua’s previous fight with Carlos Takam in October last year and the 70,000 all-seater stadium is a warm order to stage his impending heavyweight title unification bout with New Zealand’s Parker.

London’s Twickenham is next in the betting at 7/4 to host its first ever fight, while American venues Madison Square Garden and the MGM Grand are next in the betting at 10/1 and 12/1 respectively.

Joshua 1/20 to maintain unbeaten record

With AJ’s team ’95 per cent’ sure that Parker will sign to fight on March 31, Betway make Joshua the overwhelming 1/20 favourite to come out on top.

Parker, the WBO title holder, looks up against it versus the unbeaten Joshua and the New Zealander is available at 10/1 to spring a surprise.

Betway’s Alan Alger said: “With talks seemingly nearing a conclusion, attentions have turned to where Joshua and Parker will do battle and Cardiff’s Principality Stadium is the 4/5 favourite.

“Joshua is yet to fight outside of the UK during his professional career and this looks likely to continue with Twickenham second in the market at 7/4. The most likely destination overseas looks to be Madison Square at 10/1 ahead of the MGM Grand which is a 12/1 chance.

“When they get it on, we have Joshua as a strong favourite to maintain his unbeaten record. AJ is 1/20 to defeat Parker who, despite being the WBO champion, looks up against it and is available at 10/1 to cause an upset.”